#include <bits/stdc++.h>

using namespace std;

int main(){
    int n;
    int sum=0;
    int f=1;
    cin >> n;
    vector<int> calories(n);
    for(int calories_i = 0; calories_i < n; calories_i++){
       cin >> calories[calories_i];
    }
    for(int i=0;i<n;++i){
        for(int j=i;j<n-1;++j){
            int a=0;
            if(calories[j]<calories[j+1]){
                a=calories[j];
                calories[j]=calories[j+1];
                calories[j+1]=a;
            }
        }
    }
        
    for(int i=0;i<n;++i){
        sum=sum+calories[i]*f;
        f=2*f;
    }
    cout<<sum;
    return 0;
}